Apparatus for feeding pulverized fuel



E. C. COVERT. APPARATUS FOR FEEDING PULVERIZED FUEL. APPLICATION HLED APR. 23. 1911.

Patenfied Jan. 18, 1921.

UNITED STATES PATENT OFFICE.

EDSON C. COVERT, OF NEW KENSINGTON, PENNSYLVANIA, ASSIGNOR TO HEYL &

PATTERSON, INCL, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

Application filed April 23, 1917.

To all whom it may concern.

Be it known that I, EDSON C. Covm'rr, a citizen of the United States, and resident of New Kensin ton, in the county of Allegheny and State Pennsylvania, have invented a new and useful Improvement in Apparatus for Feeding Pulverized Fuel; and'I do here by declare the following to be a full, clear, and exact description thereof.

My invention relates to apparatus for feeding pulverized fuel to a plurality of burners or furnaces.

The object of my invention is to provide a simple and reliable means for distributing the fuel to a plurality of fuel consuming de- ,vices; to return art of the fuel and air tothe blower; an also to furnish an efiicicnt means for automatically supplying the necessary air and fuel to make up for air and fuel that is being burned.

In the accompanying drawing, I have illustrated my invention, certain parts being broken away for purposes of clearness.

The numeral 2 deslgnates a suitable h0pper or receptacle for the pulverized fuel with the ta ering bottom 3. An injector 4 enters the ower end of the hopper 2, the outlet of said injector being separated slightly from thelower endof the pipe 5, whereby a small stream of coal and air is forced u through said pipe and discharged against't econcaved cone 6 which acts as a spreader. This cone 6 forms part of the cage 7 contained within the chamber 8 above the hopper 2. p

This ca e 7 has the openings 9 which are regulated the valve or ring 10 connected by the rod 11 to the lever 12 which at its other end is connected to a diaphragm 13 mounted on and in operative connection with suction pipe 14 communicating with the cage 7 and at its opposite end with the fan or blower 15. A p pe 16 leads from the blower to the furnaces16" to be supplied with fuel and said pipe is tap ed at intervals b the pipes 17 leading to t e burners 18. alves 19 are provided to control the supply to the furnaces.

The pi e Ripe 20 w ich communicates with the blower.

is return pipe has the section 20" of smaller diameter than pipe 16 so that the fuel suppl in the circuit is always under pressure. hat part of the fuel passing back to blower through return pipe of fuel cir- Specification of Letters Patent.

16 is connected up to the return APPARATUS FOR FEEDING PULVER'IZED FUEL.

Patented Jan. 18, 1921.

Serial No. 163,932.

cuit is again forced around the circuit with fresh fuel a nd air drawn by fan suction through mixing chambers on hopper of fuel su ply.

n operation the pulverulent fuel in the hopper 1S driven u the pipe 5 against the cone-deflector 6. T e suction pipe 14 terminates 1n the cage with variable openings controlled automatically by the diaphragm 13, so that regardless of the amount of air that IS passlng through the cage to blower, its veloclty at the cage openings will be the same, and it will pick up the same amount of fuel per cubic foot of air passing to the blower.

A slight demand for additional air and fuel will form a sli ht vacuum 'on suction pipe and cause diap ragm to move downward, thereby causing opposite end of lever 12 to move upward and also the valve 10 to enlarge the openings 9.

By my invention the fuel is fed automatically andits' feed depends on the ability of air at a given velocity tocarry fuel of a certain richness. With all the burning devices shut off theblower would continue to circulate the fuel contained in the system over and'over again.

What I claim is:

1. In apparatus for feeding pulverulent fuel, the combination of a fuel-supply, a blower, a suction-pi e connecting said blower with said fuel-supp y, a continuous ipe circuit connected to the intake and discharge of said blower, the return pipe of said circuit having a portion of smaller diameter than the outgoing pipe adjacent to said blower, and branch pipes leading from said outgoing pipe.

2. In apparatus for feeding pulverulent fuel, the combination of a fuel supply, a blower, a suction pipe, means for supplying fuel and air to said suction pipe, means controlled by the pressure in said suction pipe for varying the size of said intake opening to said pipe, a continuous pipe circult connected to the intake and discharge of said blower and branch pipes leading from said pipe circuit to the point of consumption.

3. In apparatus for feeding pulverulent fuel, the combination of a fuel reservoir, an injector, a pipe in said reservoir in line with said injector, a cage whose bottom forms a spreader for the air and fuel, a valve controlling the openings of said cage, a blower,

a suction pipe communicating with said cage and said blower, means controlled by the partial vacuum formed in said suction pipe, for moving said valve, and a pipe leading from said blower to the point of consumptiOn. a.

hln apparatus for feeding pulverulent fuel, the combination of a fuel reservoir, a blower, a suction pipe, a discharge pipe, and branches leading therefrom, said discharge pipe being in the form of a loop with its discharge end connected to said suction pipe,

and automatic means for varying the said opening between said fuel reservoir and said suction pipe by the pressure in said suction pipe.

5. In apparatus for feeding pulverized fuel, the combination of a fuel reservoir, a blower, a suction pipe connecting said blower with said reservoir, a continuous pipe circuit connected to the intake and discharge of said blower, means for producing a dust naeacee cloud of fuel suspended in air in said fuel reservoir, and means for automatically varying the size oi the opening" between said fuel reservoir and said suction pipe.

6. in apparatus for feeding pulverized fuel, a combination of a fuel supply, a blower and suction pipe, a continuous pipe circuit connected to the intake and discharge of said blower, branch pipes leading from said pipe circuit to the point oi consumption, and a valve for regulating the supply of fuel and air to said suction pipe, the said valve being controlled by the pressure in said suction pipe for maintaining a constant velocity of the air through the opening to said suction pipe. 7

In testimony whereof, I the said EnsoN C. Covnn'r, have hereunto set my hand.

EDSON C. COVERT. Witnesses JOHN F. WILL, leans l3. Quinn. 

